Then, chances are you already know what an Arduino ... the Uno), fewer GND pins (two versus three), and no IOREF pin, which the Uno includes. You'll also notice that the Nano's pins are male ...

If you want to make your Arduino ... a separate 4-pin female header along with 3.3V and GND for connecting a 4-pin 3.3V Bluetooth module or a TTL serial device. Likewise, the I 2 C SDA and SCL lines ...

an ATMEGA328P (chip used in Arduino UNO) , or any other AVR microcontroller. Arduino IDE cable. Bread Board and an Atmega328p or another Arduino Jumpers and male headers if you are using a Bread board ...